CN109066607A - A kind of voltage acceleration method and device of the change time limit distance protection for power network line - Google Patents
A kind of voltage acceleration method and device of the change time limit distance protection for power network line Download PDFInfo
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- CN109066607A CN109066607A CN201810785590.1A CN201810785590A CN109066607A CN 109066607 A CN109066607 A CN 109066607A CN 201810785590 A CN201810785590 A CN 201810785590A CN 109066607 A CN109066607 A CN 109066607A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The present invention provides a kind of voltage acceleration method and device of change time limit distance protection for power network line; judge whether to need to adjust the distance that III sections of operation time limit is protected to be adjusted by the direction of tide criterion and fault resistance criterion of foundation; and when criterion confirmation needs to adjust the distance and III sections of operation time limit is protected to be adjusted, the amendment of distance protection III sections of operation time limit is carried out by the calculation formula of setting.Method and apparatus of the present invention can be such that III sections of distance protection of operation time limit is obviously shortened for being mounted on the change time limit distance protection of power network line trend receiving end when route generation is through big resistance singlephase earth fault and only distance protection III sections of movements.
Description
Technical field
The present invention relates to relay protection fields, and more particularly, to a kind of change time limit distance for power network line
The voltage acceleration method and device of protection.
Background technique
Adaptive setting and correct definite value are to ensure that protective relaying device is brought into normal play the necessary condition of performance, at present power grid
Relay protection setting include route protection, bus protection, tranformer protection, breaker protection, failure protection overvoltage and remote
Jump protection etc..Wherein, setting valve of most of protections in capital construction investment is adapted to the variation of power grid part, generally will not frequency
Numerous change definite value.And the cooperating apart from back-up protection apart from back-up protection needs and adjacent lines of route protection, in grid line
The cut-offfing of road, it is newly-built during, need to recalculate line related definite value, and be issued to related substation's change definite value.It is real
On border, the inconsistency of construction project plan and implementation, the definite value for needing to change can't one-time-reach-place, will cause more toward contact
Definite value loses cooperation during changing.
Become time limit distance protection and utilizes relevant parameter of the distance protection in route fault actions, such as ranging, voltage,
Electric current etc., in addition relevant information off-line, such as I sections of distance, II sections, III sections of impedance definite values and line length etc., it is automatic to calculate
The operation time limit of sector protection out, can be realized the automatic cooperation in adjacent lines sector protection act time limit.Though its
It so not can be reduced the workload of route protection adaptive setting, but be adapted to the variation of power grid part, except cut-offfing or create line
Outside the definite value on road itself, adjacent lines protection is generally not required to change definite value.
For being mounted on the change time limit distance protection of Line Flow receiving end, when route occurs through big resistance singlephase earth fault
When, protection measures deficient range, that is, the distance of the failure measured to protection installation place is the several times of actual range, and only distance is protected
It protects III sections of movements and automatic calculated distance protection III sections of operation time limit will be too long.In order to solve big resistance single-phase earthing
Trend receiving end becomes the too long problem of III sections of operation time limits of time limit distance protection when failure, it is necessary to pass through correlation technique and device
III sections of operation time limits are protected to shorten, accelerate protection speed.
Summary of the invention
Trend receiving end becomes III sections of time limit distance protection when in order to solve big resistance singlephase earth fault existing for background technique
The too long problem of operation time limit is described the present invention provides the voltage accelerated method of the change time limit distance protection for power network line
Method includes:
Acquisition becomes the instantaneous value of two sub-value of three-phase voltage and electric current of time limit distance protection installation place, according to the three-phase electricity
The instantaneous value of two sub-values is pressed to determine voltage fundamental phasor valueAccording to the instantaneous of two sub-value of three-phase current
It is worth and determines current first harmonics phasor valueAnd faulted phase voltage fundamental phasors are set and areIts value, which is equal to, to break down
Phase voltage fundamental phasor value；
According to the voltage fundamental phasor value of the phase and change time limit distance protection installation place that break down It calculates
Positive sequence voltage phasor
According to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero-sequence currentWith, with
And the current first harmonics phasor value according to the phase and change time limit distance protection installation place that break down Calculate positive sequence electricity
Flow phasor
When according to the zero-sequence currentWith forward-order current phasorDetermining value is unsatisfactory for the direction of tide criterion established
F1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value meets the fault resistance criterion F established2
When, according to faulted phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental phasors
And the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIRevised distance protection III sections are calculated to move
Make time limit t 'III。
Further, the voltage fundamental phasor value of the basis breaks down phase and change time limit distance protection installation placeCalculate positive sequence voltage phasorInclude:
When what is broken down is A phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is B phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is C phase, positive sequence voltage phasorCalculation formula are as follows:
Further, according to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero sequence electricity
StreamAnd the current first harmonics phasor value according to the phase and change time limit distance protection installation place that break downMeter
Calculate forward-order current phasorInclude::
Zero-sequence currentCalculation formula are as follows:
When what is broken down is A phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is B phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is C phase, forward-order current phasorCalculation formula are as follows:
Further, described when according to the zero-sequence currentWith forward-order current phasorDetermining value is unsatisfactory for foundation
Direction of tide criterion F1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value meets the failure transition established
Resistance criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental wave phase
AmountAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIICalculate revised distance
Protect III sections of operation time limit t 'IIIInclude:
According to zero-sequence currentWith forward-order current phasorEstablish direction of tide criterion, the formula of the direction of tide criterion
Are as follows:
Wherein, the F1Range be -60 °≤F1≤60°；
According to zero-sequence currentWith positive sequence voltage phasorEstablish fault resistance criterion F2, formula are as follows:
Wherein, the F2Range be-D≤F2≤ D, works as CLWhen > m,Work as CLWhen≤m,The N is the resistance coefficient of setting, CLFor the length of actual electric network route, m is that the power network line of setting is long
Angle value；
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value be unsatisfactory for 60 °≤F1≤
60 °, and according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value satisfaction-D≤F2When≤D, root
According to faulted phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental phasorsAnd
The nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIWhen calculating revised distance protection III sections of movements
Limit t 'IIIFormula are as follows:
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value meet 60 °≤F1≤60°
When, or according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value be unsatisfactory for-D≤F2When≤D,
The voltage accelerated method terminates.
According to another aspect of the present invention, the present invention provides a kind of voltage of change time limit distance protection for power network line
Accelerator, described device include:
Data acquisition unit is used to acquire the wink for becoming two sub-value of three-phase voltage and electric current of time limit distance protection installation place
Duration determines voltage fundamental phasor value according to the instantaneous value of two sub-value of three-phase voltageAccording to described
The instantaneous value of two sub-value of three-phase current determines current first harmonics phasor value And faulted phase voltage fundamental phasors are set and areIts value is equal to the voltage fundamental phasor value of the phase to break down；
First computing unit is used for according to the phase to break down and becomes the voltage fundamental phase of time limit distance protection installation place
MagnitudeCalculate positive sequence voltage phasor
Second computing unit is used for according to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero-sequence currentAnd the electric current base according to the phase and change time limit distance protection installation place that break down
Wave phasor valueCalculate forward-order current phasor
Third computing unit is used for when according to the zero-sequence currentWith forward-order current phasorDetermining value is unsatisfactory for
The direction of tide criterion F of foundation1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value meets the event established
Hinder transition resistance criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before described device starts1Moment faulted phase voltage
Fundamental phasorsAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIAfter calculating amendment
III sections of operation time limit t ' of distance protectionIII。
Further, described device further includes parameter set unit, is used to be arranged nargin COEFFICIENT K1, former distance protection
III sections of operation time limit tIII, resistance coefficient N, actual electric network route length CLAnd the line length value m of setting.
Further, first computing unit is according to the phase to break down and the voltage of change time limit distance protection installation place
Fundamental phasors valueCalculate positive sequence voltage phasorInclude:
When what is broken down is A phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is B phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is C phase, positive sequence voltage phasorCalculation formula are as follows:
Further, second computing unit is according to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero-sequence currentAnd the electric current base according to the phase and change time limit distance protection installation place that break down
Wave phasor valueCalculate forward-order current phasorInclude::
Zero-sequence currentCalculation formula are as follows:
When what is broken down is A phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is B phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is C phase, forward-order current phasorCalculation formula are as follows:
Further, the third computing unit is according to the zero-sequence currentWith forward-order current phasorDetermining value is not
Meet the direction of tide criterion F established1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value, which meets, to be established
Fault resistance criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before described device starts1Moment failure phase
Voltage fundamental phasorAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIICalculating is repaired
III sections of operation time limit t ' of distance protection after justIIIInclude:
According to zero-sequence currentWith forward-order current phasorEstablish direction of tide criterion, the formula of the direction of tide criterion
Are as follows:
Wherein, the F1Range be -60 °≤F1≤60°；
According to zero-sequence currentWith positive sequence voltage phasorEstablish fault resistance criterion F2, formula are as follows:
Wherein, the F2Range be-D≤F2≤ D, works as CLWhen > m,Work as CLWhen≤m,The N is the resistance coefficient of setting, and m is the line length value of setting；
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value be unsatisfactory for 60 °≤F1≤
60 °, and according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value satisfaction-D≤F2When≤D, root
According to faulted phase voltage fundamental phasorsΔ t before described device starts1Moment faulted phase voltage fundamental phasorsAnd
The nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIWhen calculating revised distance protection III sections of movements
Limit t 'IIIFormula are as follows:
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value meet 60 °≤F1≤60°
When, or according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value be unsatisfactory for-D≤F2When≤D,
The voltage accelerator terminates to run.
The voltage acceleration method and device for the change time limit distance protection for power network line that technical solution of the present invention provides
Judge whether to need to adjust the distance by the direction of tide criterion and fault resistance criterion of foundation to protect III sections of operation time limit
It is adjusted, and when criterion confirmation needs to adjust the distance and III sections of operation time limit is protected to be adjusted, it is public by the calculating of setting
Formula carries out the amendment of distance protection III sections of operation time limit.Method and apparatus of the present invention are for being mounted on power network line
The change time limit distance protection of trend receiving end, when route occurs through big resistance singlephase earth fault and only to move for distance protection III section
When making, III sections of distance protection of operation time limit can be made to be obviously shortened.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the voltage acceleration side according to the change time limit distance protection for power network line of the preferred embodiment for the present invention
The flow chart of method；
Fig. 2 is to accelerate dress according to the voltage of the change time limit distance protection for power network line of the preferred embodiment for the present invention
The structural schematic diagram set.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the voltage acceleration side according to the change time limit distance protection for power network line of the preferred embodiment for the present invention
The flow chart of method.Voltage described in this preferred embodiment as shown in Figure 1 for the change time limit distance protection of power network line adds
Fast method 100 is since step 101.
In step 101, acquisition becomes the instantaneous value of two sub-value of three-phase voltage and electric current of time limit distance protection installation place, according to
The instantaneous value of two sub-value of three-phase voltage determines voltage fundamental phasor value It is secondary according to the three-phase current
The instantaneous value of value determines current first harmonics phasor valueAnd faulted phase voltage fundamental phasors are set and areIts value is equal to
The voltage fundamental phasor value of the phase to break down；
In step 102, according to the voltage fundamental phasor value of the phase and change time limit distance protection installation place that break downCalculate positive sequence voltage phasor
In step 103, according to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero sequence electricity
StreamAnd the current first harmonics phasor value according to the phase and change time limit distance protection installation place that break downMeter
Calculate forward-order current phasor
In step 104, when according to the zero-sequence currentWith forward-order current phasorDetermining value is unsatisfactory for the trend established
Direction criterion F1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value meets the fault resistance established
Criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental phasorsAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIRevised distance is calculated to protect
Protect III sections of operation time limit t 'III。
Preferably, the voltage fundamental phasor value of the basis breaks down phase and change time limit distance protection installation placeCalculate positive sequence voltage phasorFormula be include:
When what is broken down is A phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is B phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is C phase, positive sequence voltage phasorCalculation formula are as follows:
Preferably, described according to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero sequence
Electric currentAnd the current first harmonics phasor value according to the phase and change time limit distance protection installation place that break down
Calculate forward-order current phasorInclude::
Zero-sequence currentCalculation formula are as follows:
When what is broken down is A phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is B phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is C phase, forward-order current phasorCalculation formula are as follows:
Preferably, described when according to the zero-sequence currentWith forward-order current phasorDetermining value is unsatisfactory for the tide established
Flow direction criterion F1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value meets the failure transition electricity established
Hinder criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental phasorsAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIRevised distance is calculated to protect
Protect III sections of operation time limit t 'IIIInclude:
According to zero-sequence currentWith forward-order current phasorEstablish direction of tide criterion, the formula of the direction of tide criterion
Are as follows:
Wherein, the F1Range be -60 °≤F1≤60°；
According to zero-sequence currentWith positive sequence voltage phasorEstablish fault resistance criterion F2, formula are as follows:
Wherein, the F2Range be-D≤F2≤ D, works as CLWhen > m,Work as CLWhen≤m,The N is the resistance coefficient of setting, CLLength for actual electric network route is the length of actual electric network route,
M is the power network line length value of setting；
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value be unsatisfactory for 60 °≤F1≤
60 °, and according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value satisfaction-D≤F2When≤D, root
According to faulted phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental phasorsAnd
The nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIWhen calculating revised distance protection III sections of movements
Limit t 'IIIFormula are as follows:
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value meet 60 °≤F1≤60°
When, or according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value be unsatisfactory for-D≤F2When≤D,
The voltage accelerated method terminates.
Fig. 2 is to accelerate dress according to the voltage of the change time limit distance protection for power network line of the preferred embodiment for the present invention
The structural schematic diagram set.As shown in Fig. 2, the electricity described in this preferred embodiment for the change time limit distance protection of power network line
Pressure accelerator 200 include:
Parameter set unit 201 is used to be arranged nargin COEFFICIENT K1, former III sections of distance protection operation time limit tIII, electricity
Hinder the length C of coefficient N, actual electric network routeLAnd power network line length value m.
Data acquisition unit 202 is used to acquire two sub-value of three-phase voltage and electric current for becoming time limit distance protection installation place
Instantaneous value, voltage fundamental phasor value is determined according to the instantaneous value of two sub-value of three-phase voltageAccording to institute
The instantaneous value for stating two sub-value of three-phase current determines current first harmonics phasor valueAnd faulted phase voltage fundamental wave phase is set
Amount isIts value is equal to the voltage fundamental phasor value of the phase to break down；
First computing unit 203 is used for according to the phase to break down and becomes the voltage base of time limit distance protection installation place
Wave phasor valueCalculate positive sequence voltage phasor
Second computing unit 204 is used for according to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero-sequence currentWith, and according to the electric current of the phase and change time limit distance protection installation place that break down
Fundamental phasors valueForward-order current phasor
Third computing unit 205 is used for when according to the zero-sequence currentWith forward-order current phasorDetermining value is not
Meet the direction of tide criterion F established1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value, which meets, to be established
Fault resistance criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before described device starts1Moment failure phase
Voltage fundamental phasorAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIICalculating is repaired
III sections of operation time limit t ' of distance protection after justIII。
Preferably, first computing unit 203 is according to the phase to break down and the electricity of change time limit distance protection installation place
Press fundamental phasors valueCalculate positive sequence voltage phasorInclude:
When what is broken down is A phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is B phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is C phase, positive sequence voltage phasorCalculation formula are as follows:
Preferably, second computing unit 204 is according to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero-sequence currentAnd the electric current base according to the phase and change time limit distance protection installation place that break down
Wave phasor valueCalculate forward-order current phasorIncluding the formula with forward-order current phasor are as follows:
Zero-sequence currentCalculation formula are as follows:
When what is broken down is A phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is B phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is C phase, forward-order current phasorCalculation formula are as follows:
Preferably, the third computing unit 205 is according to the zero-sequence currentWith forward-order current phasorDetermining value
It is unsatisfactory for the direction of tide criterion F established1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value satisfaction is built
Vertical fault resistance criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before described device starts1Moment failure
Phase voltage fundamental phasorsAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIIt calculates
Revised distance protection III sections of operation time limit t 'IIIInclude:
According to zero-sequence currentWith forward-order current phasorEstablish direction of tide criterion, the formula of the direction of tide criterion
Are as follows:
Wherein, the F1Range be -60 °≤F1≤60°；
According to zero-sequence currentWith positive sequence voltage phasorEstablish fault resistance criterion F2, formula are as follows:
Wherein, the F2Range be-D≤F2≤ D, works as CLWhen > m,Work as CLWhen≤m,The N is the resistance coefficient of setting, and m is the line length value of setting；
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value be unsatisfactory for 60 °≤F1≤
60 °, and according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value satisfaction-D≤F2When≤D, root
According to faulted phase voltage fundamental phasorsΔ t before described device starts1Moment faulted phase voltage fundamental phasorsAnd
The nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIIWhen calculating revised distance protection III sections of movements
Limit t 'IIIFormula are as follows:
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value meet 60 °≤F1≤60°
When, or according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value be unsatisfactory for-D≤F2When≤D,
The voltage accelerator terminates to run.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (9)
1. a kind of voltage accelerated method of the change time limit distance protection for power network line, which is characterized in that the described method includes:
Acquisition becomes the instantaneous value of two sub-value of three-phase voltage and electric current of time limit distance protection installation place, according to the three-phase voltage two
The instantaneous value of sub-value determines voltage fundamental phasor valueInstantaneous value according to two sub-value of three-phase current is true
Constant current fundamental phasors valueAnd faulted phase voltage fundamental phasors are set and areIts value, which is equal to, to break down
The voltage fundamental phasor value of phase；
According to the voltage fundamental phasor value of the phase and change time limit distance protection installation place that break down Calculate positive sequence
Voltage phasor
According to the current first harmonics phasor value for becoming time limit distance protection installation placeCalculate zero-sequence currentAnd according to
The current first harmonics phasor value of the phase and change time limit distance protection installation place that break down Calculate forward-order current phasor
When according to the zero-sequence currentWith forward-order current phasorDetermining value is unsatisfactory for the direction of tide criterion F established1, and
According to the zero-sequence currentWith positive sequence voltage phasorDetermining value meets the fault resistance criterion F established2When, according to
Faulted phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental phasorsAnd it sets
The nargin COEFFICIENT K set1With former distance protection III sections of operation time limit tIIICalculate revised distance protection III sections of operation time limits
t′III。
2. the method according to claim 1, wherein phase and change time limit distance protection that the basis breaks down
The voltage fundamental phasor value of installation placeCalculate positive sequence voltage phasorFormula be include:
When what is broken down is A phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is B phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is C phase, positive sequence voltage phasorCalculation formula are as follows:
3. the method according to claim 1, wherein according to the current first harmonics phase for becoming time limit distance protection installation place
MagnitudeCalculate zero-sequence currentAnd the electricity according to the phase and change time limit distance protection installation place that break down
Flow fundamental phasors valueCalculate forward-order current phasorInclude::
Zero-sequence currentCalculation formula are as follows:
When what is broken down is A phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is B phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is C phase, forward-order current phasorCalculation formula are as follows:
4. the method according to claim 1, wherein described when according to the zero-sequence currentWith forward-order current phase
AmountDetermining value is unsatisfactory for the direction of tide criterion F established1, and according to the zero-sequence currentWith positive sequence voltage phasorReally
Fixed value meets the fault resistance criterion F established2When, according to faulted phase voltage fundamental phasorsBefore the method starting
Δt1Moment faulted phase voltage fundamental phasorsAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of movement
Time limit tIIICalculate revised distance protection III sections of operation time limit t 'IIIInclude:
According to zero-sequence currentWith forward-order current phasorEstablish direction of tide criterion, the formula of the direction of tide criterion are as follows:
Wherein, the F1Range be -60 °≤F1≤60°；
According to zero-sequence currentWith positive sequence voltage phasorEstablish fault resistance criterion F2, formula are as follows:
Wherein, the F2Range be-D≤F2≤ D, works as CLWhen > m,Work as CLWhen≤m,The N is the resistance coefficient of setting, CLFor the length of actual electric network route, m is that the power network line of setting is long
Angle value；
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value be unsatisfactory for 60 °≤F1≤ 60 °,
And according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value satisfaction-D≤F2When≤D, according to event
Hinder phase voltage fundamental phasorsΔ t before the method starts1Moment faulted phase voltage fundamental phasorsAnd setting
Nargin COEFFICIENT K1With former distance protection III sections of operation time limit tIIICalculate revised distance protection III sections of operation time limits
t′IIIFormula are as follows:
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value meet 60 °≤F1At≤60 °,
Or according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value be unsatisfactory for-D≤F2When≤D, institute
Stating voltage accelerated method terminates.
5. a kind of voltage accelerator of the change time limit distance protection for power network line, which is characterized in that described device includes:
Data acquisition unit is used to acquire the instantaneous of two sub-value of three-phase voltage and electric current for becoming time limit distance protection installation place
Value, determines voltage fundamental phasor value according to the instantaneous value of two sub-value of three-phase voltageAccording to described three
The instantaneous value of two sub-value of phase current determines current first harmonics phasor value And faulted phase voltage fundamental phasors are set and areIts value is equal to the voltage fundamental phasor value of the phase to break down；
First computing unit is used for according to the phase to break down and becomes the voltage fundamental phasor value of time limit distance protection installation placeCalculate positive sequence voltage phasor
Second computing unit is used for according to the current first harmonics phasor value for becoming time limit distance protection installation placeMeter
Calculate zero-sequence currentAnd the current first harmonics phasor value according to the phase and change time limit distance protection installation place that break downCalculate forward-order current phasor
Third computing unit is used for when according to the zero-sequence currentWith forward-order current phasorDetermining value is unsatisfactory for establishing
Direction of tide criterion F1, and according to the zero-sequence currentWith positive sequence voltage phasorDetermining value meets the failure mistake established
Cross resistance criterion F2When, according to faulted phase voltage fundamental phasorsΔ t before described device starts1Moment faulted phase voltage fundamental wave
PhasorAnd the nargin COEFFICIENT K of setting1With former distance protection III sections of operation time limit tIIICalculate it is revised away from
From III sections of operation time limit t ' of protectionIII。
6. device according to claim 5, which is characterized in that described device further includes parameter set unit, is used to set
Set nargin COEFFICIENT K1, former III sections of distance protection operation time limit tIII, resistance coefficient N, actual electric network route length CLAnd
The power network line length value m of setting.
7. device according to claim 6, which is characterized in that first computing unit is according to the phase and change to break down
The voltage fundamental phasor value of time limit distance protection installation placeCalculate positive sequence voltage phasorFormula be packet
It includes:
When what is broken down is A phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is B phase, positive sequence voltage phasorCalculation formula are as follows:
When what is broken down is C phase, positive sequence voltage phasorCalculation formula are as follows:
8. device according to claim 6, which is characterized in that second computing unit is pacified according to time limit distance protection is become
Current first harmonics phasor value at dressCalculate zero-sequence currentAnd according to range line when the phase and change to break down
Current first harmonics phasor value from protection installation placeCalculate forward-order current phasorInclude: and forward-order current phasor
Formula are as follows:
Zero-sequence currentCalculation formula are as follows:
When what is broken down is A phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is B phase, forward-order current phasorCalculation formula are as follows:
When what is broken down is C phase, forward-order current phasorCalculation formula are as follows:
9. device according to claim 6, which is characterized in that the third computing unit is according to the zero-sequence currentWith
Forward-order current phasorDetermining value is unsatisfactory for the direction of tide criterion F established1, and according to the zero-sequence currentWith positive sequence electricity
Press phasorDetermining value meets the fault resistance criterion F established2When, according to faulted phase voltage fundamental phasorsIt is described
Δ t before device starts1Moment faulted phase voltage fundamental phasorsAnd the nargin COEFFICIENT K of setting1With former distance protection
III sections of operation time limit tIIICalculate revised distance protection III sections of operation time limit t 'IIIInclude:
According to zero-sequence currentWith forward-order current phasorEstablish direction of tide criterion, the formula of the direction of tide criterion are as follows:
Wherein, the F1Range be -60 °≤F1≤60°；
According to zero-sequence currentWith positive sequence voltage phasorEstablish fault resistance criterion F2, formula are as follows:
Wherein, the F2Range be-D≤F2≤ D, works as CLWhen > m,Work as CLWhen≤m,
The N is the resistance coefficient of setting, and m is the line length value of setting；
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value be unsatisfactory for 60 °≤F1≤ 60 °, and
According to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value satisfaction-D≤F2When≤D, according to failure
Phase voltage fundamental phasorsΔ t before described device starts1Moment faulted phase voltage fundamental phasorsAnd setting
Nargin COEFFICIENT K1With former distance protection III sections of operation time limit tIIICalculate revised distance protection III sections of operation time limit t 'III
Formula are as follows:
When according to the zero-sequence current for calculating determinationWith forward-order current phasorObtained F1Value meet 60 °≤F1At≤60 °,
Or according to the zero-sequence current for calculating determinationWith positive sequence voltage phasorObtained F2Value be unsatisfactory for-D≤F2When≤D, institute
Stating voltage accelerator terminates to run.
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